feat: add material asset workspace

.planning/phases/009-material-asset-workspace/009-RESEARCH.md

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+# Phase 9 Research: Material and Asset Workspace
+
+## Findings
+
+The existing APIs are sufficient for a browser proof:
+
+- `POST /api/v1/materials`
+- `GET /api/v1/ontology`
+- `POST /api/v1/teaching-assets/prompts`
+- `GET /api/v1/teaching-assets`
+
+The frontend should make candidate state obvious and preserve evidence in
+compact text. A full graph canvas would be premature.
+
+## Recommendation
+
+- Use a text ingestion form.
+- Render candidate concepts as selectable options for asset prompt generation.
+- Show counts for concepts, edges, gaps, and prompts.
+- Show model verification guard in the generated prompt output.